Malicious PDF — malware analysis report

Static analysis result for SHA-256 6503276ecbc5cfd7…

MALICIOUS

PDF

91.7 KB Created: 2021-02-28 20:50:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 226df3c641f670d3ebd1f160e22c2b72 SHA-1: 9bf6ec8c52a958f6890ebe53681080b26e6d23b7 SHA-256: 6503276ecbc5cfd7b059d108ea13d193ccf197db2f771599489f007c9d3a5228
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/strik?utm_term=pippin+script+characters PDF link annotation
    • http://nigoguno.scienceontheweb.net/8618904063.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426813/normal_6000b0dae80ab.pdfIn PDF document text
    • http://wajufogisabo.iblogger.org/expense_report_system_meaning.pdfIn PDF document text
    • http://erogancolumbia.site/georges_secret_key_to_the_universe_read_aloud5hxog.pdfIn PDF document text
    • http://proita.space/los_crimenes_de_la_calle_morgue_pelicula_youtubem2dr9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388157/normal_5febf091e8765.pdfIn PDF document text
    • http://fimugunidaditu.iblogger.org/ikea_dubai_catalogue_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/jiEibKu/turbo_car_traffic_racing_game_download_uptodown.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/45856239243.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/15818274300.pdfIn PDF document text
    • http://gididowofugu.iblogger.org/36412191308.pdfIn PDF document text
    • http://kasyanbeauty.com/mesudamupeninibilajqz.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/deep_sparse_rectifier_neural_networks.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/medio_de_comunicacion_mas_antiguo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nawuxek.rf.gd/zadafobenokumidezubila.pdfIn PDF document text
    • http://jojomuge.epizy.com/princeton_review_ap_calculus_ab.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 4992 bytes
SHA-256: 9101e030f9fa95403bce5fd6adc6e56931216c4a68c4f997973e4533bd1642cb
font_01_sfnt_off00013e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E69 10384 bytes
SHA-256: d836199c18f902da391b316eddd25ddc7282da34abd563f512ede36a0ce37af0